ubuntu-x-swat team mailing list archive
-
ubuntu-x-swat team
-
Mailing list archive
-
Message #92619
[Bug 580225] Re: [gm45] Backlight sometimes stays off after resume on Lenovo X200
I have the same bug on a HP TouchSmart tm2, with the added bonus that
the backlight problems also happen at startup every now and then.
The easiest way I have found to trigger this situation is to set
brightness to 0 on a terminal (as root)
echo 0 > /sys/class/backlight/acpi_video0/brightness
Any other brightness set in this way is applied correctly. However,
after setting 0, the backlight never comes back on.
A workaround I use is to change screen orientation. For some reason, the
command
xrandr -o right
(followed by xrandr -o normal to get it back to normal) changes so many
things in the display settings that the backlight comes back on. I have
now assigned hotkeys to these commands, so that I can log in blindly,
then press the hotkeys, and have a working backlight.
I should also note that this problem does not occur after switching to
ATI graphics with the vga_switcheroo kernel module.
--
[gm45] Backlight sometimes stays off after resume on Lenovo X200
https://bugs.launchpad.net/bugs/580225
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in ubuntu.
References